The Stand has become somewhat iconic over the years, with many loving the view of the cricket from the seats on top, but many more felt it was an unpleasant eyesore at the Sea End.
The Gilligan Stand will make way for a brand new South Stand, which will be in place for the 2011 season.
This South Stand will host the new Media Centre, the security control room, as well as the already established Howzat! Centre.
Radius Physiotherapy, which is currently situated in the Indoor School, will move down to the South Stand, which will also have around 100 seats on top.
Sussex chief executive Dave Brooks said: "While we started work at the North End of the ground a month ago, many of our supporters and members will only now truly realise that change is upon us.
"For many, the Gilligan Stand was an ugly eyesore - though for those who loved to sit on top of it and watch the cricket, it was a treasured area.
"And then there were those Sussex legends that learned their game in the nets, which used to be housed in the Stand. So, today, is a day when we remember our history but also look to the future."
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